Lumix 14-42mm PZ zooming out focus while filming

I would like to know if someone is able with that lense to zoom out while filming without loosing focus. I don't know if it is a limitation of this compact lense or if I'm missing something but you can see in this small clip that the focus is always lost at the two exact same spots:

I personally own a Panasonic Lumix G5. I tried with "Continuous AF" enabled/disabled, with AFS (Single) or continuous (AFC), in iAuto or Aperture priority using f/5.6, etc. I always get the same results.